/*
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package demo_canban;

/**
 *
 * @author LAPTOPPT1
 */
public class hinhtron {
    private float bk;

    public float getBk() {
        return bk;
    }

    public void setBk(float bk) {
        this.bk = bk;
    }

    public hinhtron(float bk) {
        this.bk = bk;
    }

    public hinhtron() {
        this.bk = 0;
    }
    
    public  void chuvi(){
        float v = (float) ((4*Math.PI*Math.pow(bk, 2))/3);
    }
    
    public  void dientich(){
        
    }
}
